Blowpipe.



4 no. 658,29l. Patented sept. la, |900.

F. SPEIDEL.

BLUWPIPE.

(Application le'd Nov. 20, 1899.)

(N0 Modbl.)

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UNITED STATES PATENT OFFICE.

FRIEDRICH SPEIDEL, OF PFORZHEIM, GERMANY.

BLOWPIPE.

SPECIFICATION forming part of Letters Patent N o. 658,291, datedSeptember 18, 1900. Application filed November 20, 1899- Serial No.737,680. (No model.)

To all whom, it Wawy concern:

Be it known that I, FRIEDRICH SPEIDEL, a subject of the Emperor ofGermany, and a resident of Pforzheim, Germany, have invented certain newand useful Improvements in Blowpipes, of which the following is aspecification.

The object of this invention is to provide an improved gas-blowpipe bymeans of which the gas-supply may be controlled at will and which isnormally cut of, so that no gas can gain access to the main tube of theblowpipe, while a small secondary or pilot flame or jet may be keptconstantly1 burning, so that the blowpipeis always ready for use.

ln the accompanying drawings, Figure 1 is an outside view of theblowpipe. Fig. 2 is a longitudinal section of the blowpipe, the latterbeing turned to an angle of forty-five degrees. Fig. 3 is a section ofthe valve. Fig. 4 is a section of the valve-seat with the valve put inits place. Fig. 5 is a detail View showing a means employed to lock thevalve in adjusted open position.

Into the gas-inlet pipe a of a blowpipe b, which in other respects'isconstructed like an ordinary blowpipe, there is provided according tothis invention a transverse passage or chamber c, closed at one end andopen at the other end and provided with a port or passage leading toblowpipe proper. Fitted to slide wit-hin this passage or chamber is avalve d, which is forced outward by a spring e, so as to normally cutolf the gassupply to the blowpipe. The chamber c forms a part of or isattached to a coupling n, in one end of which the blowpipe b is secured,and in the other end a gas-delivery pipe o is secured. A pipe t issupported within the pipe o and communicates at its rear end with thepipe b and conducts air therefrom to the delivery end of the pipe o. Apassage p is formed in the coupling n and affords communication betweenthe interior of the coupling and the chamber c.

When it is desired to use the blowpipe, it is only necessary to pressinward thev projecting end or knobf of the sliding valve against theresisting action of the spring to cause perforations or ports therein tocoincide with similar perforations, ports, or passagesgin the gas-inletpipe ct, so that the gas may freely enter the blowpipe. When pressure onthe knob f is released, the valve will return under the expansive actionof the spring to its normal position, in which the supply of gas to theblowpipe is cut off. In the gas-inlet pipe is secured asmall gas-tube7L, the discharge end of which is situated in close proximity toflame-orifice of the blowpipe, where it forms a constantly-burninggas-jet, while the main supply of gas is cut off from the blowpipe b vmeans of the valve. By pressing upon the valve, as before described, gasis admitted into the main gastubeoof the blowpipe, which becomes ignitedby the pilot-jet. Air is supplied to the delivery end of the pipe othrough the pipe and the blowpipe is then ready for use. By thisarrangement the gas supply may be varied by Vapplying moreV or lesspressure to the valve and a considerable saving of gas is insured.

In cases wherethe blowpipe is required to be in almost constant use witha flame of a predetermined degree of heat I provide an arrangement foradjusting the position of the valve and retaining it in the adjustedposition. Fig. shows such an arrangement. A rod k is fitted to slide ina sleeve or socket Z on the blowpipe, the said rod being attached to orengaging with the projecting end or headfof the valveV d, so that byadjusting the position of the rod in the sleeve or socket the valve canbe pressed more or less into its seat to regulate the passage of gasinto the blowpipe and be fixed in its adjusted position by any suitablemeans-such, for eX- ample, as a pinching-screw m, securing the sleeve orsocket against the rod. The rod k may be secured by soldering orotherwise to the valve-headf, or it may be provided with a bent end tobear on the said valve-head f.

I claim- In a blowpipe, a gas-delivery pipe, a gas-inlet pipe having atransverse chamber communicating with the gas-delivery pipe, a slidingvalve seated in said chamber to control the communication between theinlet and outlet pipes, a spring engaging the valve and IOO normallytending no force it outwardly to In testimony whereof I have signed myclosed position, n, sleeve mounted on the biowl name to thisspecification in lthe presence of pipe, a rod siidably supported in thesleeve, two subscribing witnesses.

a heed on the rod engaging the outer end of FRIEDRICH SPEIDEL. 5 thevalve, and a. pinching-screw to look the Vitnesses:

.rod in the sleeve, substantially as and for the LUDWIG SCHWEITER,

purpose seb forth. HERMAN '/VAGNER.

